【摘要】 采用高内水相双重乳液模板法制备贯通多孔聚合物微球,并将其应用于催化剂负载和Cu2+吸附.首先,通过增加水相,使单一小分子表面活性剂12-丙烯酰氧-9-油酸(AOA)稳定的反相高内相乳液(W/O HIPEs)发生相转变,一步制备出高内水相双重乳液;然后以此为模板,采用辐射法和引发剂引发聚合两种方式制备聚(苯乙烯-二甲基丙烯酸乙二醇酯)微球.通过扫描电镜观察发现,采用辐射法聚合能够得到贯通多孔的聚合物微球,而化学法聚合只能得到中空的封闭微球.将贯通多孔微球水解使其羧基化,用于铜离子的吸附.结果表明水解后多孔微球对Cu2+的吸附量随p H值的增加先增后减,在p H=5时达到最高值175 mg/g(2.75 mmol/g).此外,利用原位生成的方式,在贯通多孔微球上负载Pd纳米粒子,并将其用于催化肉桂醛加氢反应.结果表明水解多孔微球比未水解多孔微球具有更高的催化效率;热重分析和透射电子显微镜观察显示,水解多孔微球比未水解多孔微球能够负载更多的Pd纳米粒子,且纳米粒子分散更均匀.更多还原

【Abstract】 High internal water phase double emulsions were used as the templates to prepare interconnecting porous poly( styrene-divinyl benzene-ethylene glycol dimethacrylate) microspheres which were applied in the load of catalysts and the adsorption of heavy metal ions. First,high internal water phase double emulsions were prepared via phase inversion of water-in-oil high internal phase emulsions( W / O HIPEs) stabilized solely by12-acryloxy-9-octadecenoic acid( AOA) through increasing the content of water phase. The polymerization of these emulsions was then initiated by either γ-ray irradiation or chemical initiators. Scanning electrical microscopy( SEM) images showed that interconnecting porous microspheres were reached by using γ-ray irradiation,while only hollow microspheres were obtained by using chemical initiators. After hydrolysis,interconnecting porous microspheres prepared by γ-ray irradiation were modified with carboxyl groups,which were used to adsorb Cu2 +ions. It was found that the adsorption capacity of Cu2 +first increased and then decreased with the increasing of p H,and the maximum adsorption capacity was 175 mg / g at p H = 5. In addition,using in situ reduction,interconnecting porous microspheres were loaded with Pd nanoparticles which were used to catalyze the hydrogenation of cinnamaldehyde. Thermogravimetric analysis and TEM results showed that Pd @ hydrolyzed porous microspheres had higher catalytic efficiency due to the higher load of uniform dispersed Pd nanoparticles,while Pd@ unhydrolyzed porous microspheres had lower catalytic efficiency owing to the lower load of aggregated Pd particles.更多还原